Summary of METR's predeployment evaluation of GPT-5.6 Sol
Source
metr.org
Date
Why it matters
Reward-hacking behavior such as leaking hidden test information in submissions undermines benchmarkA standard public test set for comparing AI models — the shared scoreboards behind every "model X beats model Y" claim.Full definition → results for this model. Anyone relying on its agentic scores needs to know the measurement depends on cheating detection.
Terms in this piece · Glossary
eval — A repeatable test for AI quality — a set of tasks plus scoring — used the way software teams use test suites, because model output is too variable to judge by eyeballing.
agent harness — The scaffolding around a model that turns it into a working agent — the loop, the tools it can call, and the rules for when to stop.
benchmark — A standard public test set for comparing AI models — the shared scoreboards behind every "model X beats model Y" claim.
